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rsync CVE-2026-70458

| EUVDEUVD-2026-58046 HIGH
Out-of-bounds Write (CWE-787)
2026-08-13 VulnCheck
8.8
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
8.8 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
8.2 HIGH

Network-reachable with no credentials required; high availability impact from heap/stack corruption, low integrity from bounded memory overwrite; no confidentiality impact identified.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
SUSE
8.2 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Red Hat
8.2 HIGH
qualitative

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
Source Code Evidence Fetched
Aug 13, 2026 - 15:42 vuln.today
Analysis Generated
Aug 13, 2026 - 15:42 vuln.today
CVE Published
Aug 13, 2026 - 14:44 cve.org
HIGH 8.8

DescriptionCVE.org

rsync 3.0.0 before 3.5.0 contains an out-of-bounds write vulnerability that allows attackers to corrupt memory by triggering HLINK_BUMP processing on file entries with the FLAG_HLINKED flag set while the hard-link preservation option is inactive. Attackers can exploit the missing F_SUM field in the file_struct layout to access memory past the end of the allocated structure, corrupting adjacent heap or stack data.

AnalysisAI

Out-of-bounds write in rsync 3.0.0 through 3.4.x enables remote memory corruption when a peer sends file entries with the FLAG_HLINKED flag set against a receiver with hard-link preservation disabled. The missing F_SUM field in the file_struct layout permits writes beyond the allocated structure boundary, corrupting adjacent heap or stack data and likely causing denial-of-service or potentially enabling code execution. Vendor-released patch v3.5.0 is available; no public exploit or CISA KEV listing has been confirmed at time of analysis.

Technical ContextAI

rsync is a widely deployed file synchronization utility using a delta-transfer algorithm over TCP (default port 873). The vulnerability resides in the HLINK_BUMP processing path, which handles hard-link metadata during file transfer. The file_struct in affected versions (CPE: cpe:2.3:a:rsyncproject:rsync:*:*:*:*:*:*:*:*) omits the F_SUM checksum field from its layout when hard-link preservation is inactive (i.e., --hard-links/-H not passed). When a file entry arrives with FLAG_HLINKED set under this condition, HLINK_BUMP logic indexes past the allocated struct boundary - a textbook CWE-787 (Out-of-Bounds Write). The corruption target is adjacent heap or stack memory, which could overwrite allocator metadata, function pointers, or return addresses depending on runtime layout.

RemediationAI

Upgrade to rsync 3.5.0, released at https://github.com/RsyncProject/rsync/releases/tag/v3.5.0 and designated a major security release by the vendor. The full security details are documented in GHSA-gg3m-4m9m-268h at https://github.com/RsyncProject/rsync/security/advisories/GHSA-gg3m-4m9m-268h and the Samba project NEWS file at https://download.samba.org/pub/rsync/NEWS#3.5.0. For environments unable to patch immediately, restrict access to rsync daemons (TCP port 873) via firewall rules or network ACLs to trusted source addresses only - note this mitigates the daemon-exposure vector but does not protect rsync clients connecting to untrusted servers. As an additional control, administrators may audit whether any rsync daemon configurations expose the service to untrusted networks and temporarily disable those services until patching is complete. There is no known workaround that preserves full rsync functionality while eliminating the vulnerability.

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Affected
SUSE Linux Enterprise Micro 5.3 Affected

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CVE-2026-70458 vulnerability details – vuln.today

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